Now I get it!
The most exceptional announcement was that he expects any sale of TikTok to a US company must be accompanied by a finder’s fee of sorts paid to the US Treasury
So TikTok, by itself, is a "no-no" due "security matters".
However, TikTok, if (and when) owned by an American is absolutely fine.
Gee whiz, slap me silly and call my Sally!
By the way, does this rule apply to Huawei?